Rolling mill



May 19,V 1936.

H. srUTlNG ROLLING MILL.

'Filed May 18, 1934 Patente May 19, 1.936

, PATENT oFF-Ice ROLLING MILL Heinrich Stting, Witten-on-tlie-Ruhr, Germany applicati@ May 18,1934, serial No. 726,378 In Germany April 4, 1933 3 Claims.

This invention relates to rolling mills for reducing tubes to a smaller diameter. These rolling mills operate without a mandrel and contain a number of devices mounted one behind the 5 otherand are known as reducing rolling mills working in an uninterrupted operation.

By correspondingly increasing the speed towards the smaller diameter passes and by tension produced therebyin the .material to be rolled" the thickness of the walls may in the central part of the tube turn out to be almost unaltered. At the ends of the tubes, however, no provision is made for transmission of the tension force so long as the ends of the tubes are freely in or out of the pass and consequently do not simultaneously extend in at least two passes.

The result is a thickening of the'wall of the tube at the ends of the tubes and waste associated therewith. This effect occurs with the reducingrolling'mills more markedly according to thereduction in diameter. The thickening of the ends of the tubes takes place along a. length which corresponds approximately to the distance between passes or to the lengthening-factor.

Since the distance between passes is a decisive factor in regard to the length of the thickened ends, it has been sought to reduce it as much 'as possible. Tube reducing rolling mills of more recent type effect a certain reduction by employing rolling devices, which combine a central drive with two roller passes on either side of the said drive. 'I'his drive contains in most cases toothed wheels of any of the usual type, for example, cone wheels, spur Wheels, hyperbolic wheels, worm wheels and the like. To all these known arrange..

ments the feature is common that the said driving means are partly arranged between the two roller passes to be driven. Consequently the distance between passes is determined by the total 40 space required by the drivingl means between the two passes and the constituent parts of the two 'passes themselves in so far as they are situated at the driving end. Reduction of the distance between passes beyond the extent attained 4'5 hitherto is hindered by the fact that one part of the driving means is arranged between both the :roller passes. In this connection a distance between the passes is to be aimedat, which is solely determined by the passes themselves and consequently by the rollerswith their axial bearings,

together with the driving means arranged directly on the roller shafts and the bearing elements of the apparatus for securing'the roller bearings.

The invention fulfils the' above-mentioned requirements by a new type of construction of the drive, in that there are arranged as driving means for the transmission wheels for the rollers only cone wheels mounted on the outer periphery of the frame body, which are in engagement with one another by means of intermediate wheels, the 5 two sets of rollers only being separated by the wall of their casing and disposed as close to one another as is possible in consideration of the bearing strength ofthe material, of which the wall of the housing consists. 10

One embodiment of the subject matter of the invention is illustrated by way of example in the accompanying drawing, in whichz- Y Fig. 1 shows the mechanism in elevation;

Fig. 2 is a view-partly in cross section looking 15 from the left of Fig. 1, and

Fig. 3 is a section to a reducedscale on the line III- III in Fig. 2, some parts being omitted.l

Fig. 1 shows a pass, which consists of fourl rollers i, mounted on shafts 2 carried in bear- 20 ings 3 and 4. Spur wheels 5 on lthe ends of the roller shafts serve to effect driving. All members mentioned hitherto lie in the plane I-I, that is to say, in the plane of the first roller pass. This plane is the plane of the toothed rollers I0, which 25 is shown in Fig. 2 by II-II parallel and adjacent to the plane I--I.

In the latter mentioned plane there lie the shafts 6 on which the spur wheels l are mounted. 'I'hese spur wheels are in engagement with the 30' above-mentioned spur wheels 5. The shafts 6 are mounted in the bearings 8 and 9 and carry cone wheels I0 disposed entirely in an outward direction, which will be subsequently referred to as toothed rollers, according to the usual termi- 35 nology adopted for the toothed driving wheels for the rollers in rolling mills.

The shafts 6 of the toothed rollers are radially arranged as may be seen from Figure 3. Sixteen of such shafts with toothed wheels arranged 40 thereon are provided. The latter. are arranged relatively to one another to form a circle and are in engagement with one another. The four toothed wheels designated in Figure 3 by nu,-

meral I0 serve by means of the spur wheels 5 45 and 'l to drive the pass lying in the plane I-I. The four toothed wheels l0' covering an arc of 45 degrees are connected to four toothed driving wheels. l', which serve to drive the second pass which is displced through-45 degrees. 'I'he latter 50 is arranged in the plane III--III (Figure 2). The wheels Il arranged between the toothed wheels I0 and lll are so-called intermediate wheels, that is to say, they serve merely to transmit the rotary movement from the wheels l0 to the wheels l0' 55 or vice versa. Their shafts are not provided with driving wheels for roller passes.

As has been seen from the above the toothed wheels I 0 and I0 and the intermediate wheels Ii are arranged on the outer periphery of the central plane II-II. This type of construction hitherto and which approximately corresponds to the diameter of the rollers themselves.

Since a roller 'mill is comprised of several roller frames arranged behind one another, the pass distance between the outer passes of two adjacent frames may not be greater than the distance between the two passes of the same frame. This condition is likewise attained with the construction set forth, since no obstacle is present to prevent the frames arranged in series from being disposed quite close toA one another.

The successful feature 'of the invention resides not solely in the fact that the length of the waste ends is about half as large as was the case hitherto, but extends to a considerable vsaving in working costs. By the close series arrangement of the passes, which is possible by this improvement, the whole length of such rolling mill is limited to less than the half of that which hitherto was regarded as the minimum. Combined therewith is of course a corresponding economy in material and costs, so that such a rolleimill yis cheaper in arrangement and construction, requires reduced working costs in regard to foundation and operating space and renders supervision in operation easier. However, advantages are also apparent in regard to roller mill technology, since by reason of the rapid sequence of the passes cooling of the material being rolled is decreased. 'Ihe tubes to be reduced pass through the rolling mill at higher temperature than hitherto, so that the quality of the rolled product is improved.

Even though in the above description four rollers have been considered, embodiments having three rollers or more than four rollers in the pass are not to be excluded, since the idea of the invention may be applied to rolling mills having a number of rollers other than four.

I claim:

1. A rolling mill comprising a thin frame body, a set of rollers arranged on each side of the frame body, supporting shafts for the rollers journalled on the respective outer side faces of the body, a circular series of intermeshing toothed wheels journalled adjacent the periphery of the body, and means located within the circle defined by the wheels for transmitting rotary motion from the wheels to the shafts.

2. A rolling mill as claimed in claim 1, wherein the axes of the circular series of toothed wheels are positioned radially of the frame body.

3. A rolling mill comprising a thin frame body, a set of rollers arranged on each side of the frame body, supporting shafts for the rollers journalled on the exterior of the frame body, spur wheels on the shafts, a series of radially arranged shafts journalled in the plane of the body, spur wheels on the latter shafts meshing with the spur wheels on the respective roller supporting shafts, and a circular series of radially arranged cone wheels at the outer periphery of the frame for driving the radial shafts, the spur wheels being located within the circle dened by the cone wheels.

HEINRICH s'rti'nNG. 

